libbb: add and use infrastructure for fixed page size optimization

function                                             old     new   delta
procps_scan                                         1121    1118      -3
getpagesize                                            6       -      -6
rpm_main                                            1037    1027     -10
rpm2cpio_main                                        120     110     -10
ptok                                                  38      21     -17
time_main                                           1282    1261     -21
mkswap_main                                          317     278     -39
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 0/6 up/down: 0/-106)           Total: -106 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/miscutils/time.c b/miscutils/time.c
index d15d363f3..0006c59d8 100644
--- a/miscutils/time.c
+++ b/miscutils/time.c
@@ -111,6 +111,10 @@ static void printargv(char *const *argv)
    This is funky since the pagesize could be less than 1K.
    Note: Some machines express getrusage statistics in terms of K,
    others in terms of pages.  */
+#ifdef BB_ARCH_FIXED_PAGESIZE
+# define pagesize BB_ARCH_FIXED_PAGESIZE
+# define ptok(pagesize, pages) ptok(pages)
+#endif
 static unsigned long ptok(const unsigned pagesize, const unsigned long pages)
 {
         unsigned long tmp;
@@ -124,6 +128,7 @@ static unsigned long ptok(const unsigned pagesize, const unsigned long pages)
         tmp = pages * pagesize; /* Larger first, */
         return tmp / 1024;      /* then smaller.  */
 }
+#undef pagesize
 
 /* summarize: Report on the system use of a command.
 
@@ -177,7 +182,7 @@ static void summarize(const char *fmt, char **command, resource_t *resp)
 {
         unsigned vv_ms;     /* Elapsed virtual (CPU) milliseconds */
         unsigned cpu_ticks; /* Same, in "CPU ticks" */
-        unsigned pagesize = getpagesize();
+        unsigned pagesize = bb_getpagesize();
 
         /* Impossible: we do not use WUNTRACED flag in wait()...
         if (WIFSTOPPED(resp->waitstatus))